1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/http/site.py b/synapse/http/site.py
index 3b0a38124e..190084e8aa 100644
--- a/synapse/http/site.py
+++ b/synapse/http/site.py
@@ -384,7 +384,7 @@ class SynapseRequest(Request):
         # authenticated (e.g. and admin is puppetting a user) then we log both.
         requester, authenticated_entity = self.get_authenticated_entity()
         if authenticated_entity:
-            requester = "{}.{}".format(authenticated_entity, requester)
+            requester = f"{authenticated_entity}.{requester}"
 
         self.site.access_logger.log(
             log_level,